Answer:
a)
[tex]\\\log_ba=c \text{ is the same as } b^c=a\\x^y=178\\y=log_x178[/tex]
b)
[tex]\\x^y=z\\\\y=\log_xz[/tex]
c)
[tex]19^{-19}=x\\\log_{19}x=-19[/tex]
d)
[tex]b^a=154\\\log_b154=a[/tex]
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